From 5a45524af33ffbce5dae96554ed095a8efd944b8 Mon Sep 17 00:00:00 2001
From: fruchti <fruchti@gvfr.de>
Date: Thu, 16 Jul 2020 23:11:09 +0200
Subject: [PATCH] Add simple smooth animation

---
 build-number.txt |  2 +-
 src/animation.c  | 22 ++++++++++++++++++++--
 src/animation.h  |  5 +++++
 3 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/build-number.txt b/build-number.txt
index 35329ed..a5c3fde 100644
--- a/build-number.txt
+++ b/build-number.txt
@@ -1 +1 @@
-361
+373
diff --git a/src/animation.c b/src/animation.c
index 5d5e147..a89b36c 100644
--- a/src/animation.c
+++ b/src/animation.c
@@ -286,6 +286,14 @@ LED_Colour_t Animation_GetColour(unsigned int step, unsigned int brightness)
 void Animation_DrawGradient(unsigned int step_bottom, unsigned int step_top,
     unsigned int brightness)
 {
+    if(step_bottom >= ANIMATION_STEPS)
+    {
+        step_bottom = 2 * ANIMATION_STEPS - step_bottom;
+    }
+    if(step_top >= ANIMATION_STEPS)
+    {
+        step_top = 2 * ANIMATION_STEPS - step_top;
+    }
     for(int i = 0; i < LED_COUNT; i++)
     {
         unsigned int step = ((LED_COUNT - 1 - i) * step_bottom + i * step_top)
@@ -301,7 +309,17 @@ void Animation_Poll(void)
     {
         return;
     }
-    LED_FrameFlag = false;
-    Animation_DrawGradient(60000, 50000, LightSensor_RelativeBrightness);
+
+    static unsigned int bottom = 0;
+    static unsigned int top = 0;
+
+    bottom += ANIMATION_STEPS / ANIMATION_DURATION_BOTTOM;
+    top += ANIMATION_STEPS / ANIMATION_DURATION_TOP;
+
+    bottom %= 2 * ANIMATION_STEPS;
+    top %= 2 * ANIMATION_STEPS;
+
+    Animation_DrawGradient(bottom, top, LightSensor_RelativeBrightness);
     LED_Commit();
+    LED_FrameFlag = false;
 }
\ No newline at end of file
diff --git a/src/animation.h b/src/animation.h
index 036115d..f9abe60 100644
--- a/src/animation.h
+++ b/src/animation.h
@@ -4,6 +4,11 @@
 
 #define ANIMATION_STEPS         65535
 
+#define ANIMATION_DURATION_BOTTOM \
+                                1000
+
+#define ANIMATION_DURATION_TOP  5000
+
 extern const unsigned int Animation_LEDOrder[LED_COUNT];
 
 void Animation_Poll(void);
\ No newline at end of file